Answer:
To Kill a Mocking Bird
Explanation:
I will be using this as my example, however you can do this for any of the novels you read, however the answers may change!
According to relevant articles referenced in WIKI "To Kill a Mockingbird is a novel by Harper Lee published in 1960. Instantly successful, widely read in high schools and middle schools in the United States, it has become a classic of modern American literature, winning the Pulitzer Prize."
Knowing the Novel's continued relevance in young adult curriculum, we are able to conclude that it is a classic in young adult literature.
The author Harper Lee did in fact aim To Kill a Mockingbird at young adults, but it holds relevance to individuals in all age groups as well.
There are many themes in To Kill a Mocking bird but here are the ones that could be considered most culturally relevant: Good vs Evil, Racism, Prejudice, Moral complexity, Legality, ETC.
Whether or not you believe the novels themes to be timeless will reflect in your individual answer, but for the sake of explanation I will take my own stance in this answer: I do consider the novels themes to be timeless, and that is reflecting now more than ever before. Despite the novel being written in 1960, one of its most prevalent themes is racism, which is incredibly relevant to our word to day as a nation wide movement for racial equality has seized the focus of the country. We saw a similar situation to the modern events in Minneapolis to the ones in April 29, 1992 during the LA riots. The novel rears its head into relevance during these times of turbulence to teach us all a lesson about prejudice and what we can do to prevent it. Another theme is Good in Evil, which will always be prevalent in our society as morality continues to be subjective.
